How can I "rotate" a Vector3?

[q_ertyuiop1234567890 (A_HumanBeing)]

How can I “rotate” a Vector3, for example I have a Vector3 (1, 0, 2) and rotate 90 degrees to get something like (2, 0, -1)?

[astraIboy (The Batman)]

Rotating a vector

function rotateVectorAround( v, amount, axis ) return CFrame.fromAxisAngle(axis, amount):VectorToWorldSpace(v) end Example use:

Script

local VERTICAL = Vector3.new(0, 1, 0) local HORIZONTAL = Vector3.new(1, 0, 1) local rotateSpeed = 1 local followSpeed = 20 local bullet = script.Parent.Bullet local target = script.Parent.Target function rotateVectorAround( v, amount, axis ) return CFrame.fromAxisAngle(axis, amount):VectorToWorldSpace(v) end --Skip the first heartbeat because it's dt i…

[zamont124 (M3rcys)]

If you’re trying to rotate a vector or vector3 (not of a basepart) you can’t but you can do it with baseparts (basepart vector).

local Part = script.Parent

Part.Rotation = Vector3.new(0,90,0) -- It is already in degrees.

Assuming you have Vector3(1,0,2):

local Part = script.Parent

Part.Rotation = Vector3.new(0,0,0) + Vector3.new(0,90,0) -- It is already degrees

[q_ertyuiop1234567890 (A_HumanBeing)]

How do I use the function? What are v, axis, and amount?

[Imperiector]

Use sin and cos

depending on what axis you want to rotate it you need to slightly change the formula

around the Z axis:
x = x * cos(angle) - y * sin(angle)
y = x * sin(angle) + y * cos(angle)
z = z

around Y axis:
x = x * cos(angle) - z * sin(angle)
y = y
z = x * sin(angle) + z * cos(angle)

around X axis:
x = x
y = -y * cos(angle) + z * sin(angle)
z = y * sin(angle) + z * cos(angle)

[tlr22 (FusionOak)]

Out of curiosity why do you need to rotate the Vector3? There might be some functions roblox already has that might be able to either simplify or solve the problem.

[q_ertyuiop1234567890 (A_HumanBeing)]

I want a script to manipulate structures (Like create or move them) and work in any direction.